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Since the Sanitation Services Inc employed by the slaughterhouses got fined for this, Arkansas under Huckabee signed a law removing requirements to verify ages of anyone working under 16. Aka no one is liable if children are working in slaughterhouses and getting chemical burns.
Here's a picture of one of the kids.
The wording could be better, it's meant that they're not liable for hiring kids since they can say that they didn't know, are not responsible for knowing.